H8SSLASH2214 datasheet(505/936 Pages) RENESAS

Il numero della parte	H8S/2214

Spiegazioni elettronici	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	936 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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Section 11 Watchdog Timer (WDT)

Rev.4.00 Sep. 18, 2008 Page 445 of 872

REJ09B0189-0400

(2) Writing to RSTCSR

RSTCSR must be written to by a word transfer to address H'FF76. It cannot be written to with

byte instructions.

Figure 11.3 shows the format of data written to RSTCSR. The method of writing 0 to the WOVF

bit differs from that for writing to the RSTE and RSTS bits.

To write 0 to the WOVF bit, the upper byte of the written word must contain H'A5 and the lower

byte must contain H'00. This clears the WOVF bit to 0, but has no effect on the RSTE and RSTS

bits. To write to the RSTE and RSTS bits, the upper byte must contain H'5A and the lower byte

must contain the write data. This writes the values in bits 6 and 5 of the lower byte into the RSTE

and RSTS bits, but has no effect on the WOVF bit.

Writing 0 to WOVF bit

Writing to RSTE and RSTS bits

Address: H'FF76

H'A5

H'00

8 7

H'5A

Write data

8 7

Figure 11.3 Format of Data Written to RSTCSR (Example of WDT0)

(3) Reading TCNT, TCSR, and RSTCSR

These registers are read in the same way as other registers. The read addresses are H'FF74 for

TCSR, H'FF75 for TCNT, and H'FF77 for RSTCSR.

H8S/2214 Scheda tecnica(PDF) 505 Page - Renesas Technology Corp